Here's my work on the https method for apt.
Encrypted connection and authentification through certificates works. This is a pre-final version. If there will be changes then only from suggestions or criticism by other people, particulary apt's author.
Feedback wellcome.
Enjoy!
apt_0.5.4-0.8.diff.gz
apt_0.5.4-0.8_i386.deb
apt-utils_0.5.4-0.8_i386.deb
libapt-pkg-dev_0.5.4-0.8_i386.deb
libapt-pkg-doc_0.5.4-0.8_all.deb
Example apt.conf